Create a collection entry programatically using CMS API

**Is your feature request related to a problem? Please describe.**

I need assistance in programmatically creating collection entries in DecapCMS.

Here's the scenario:

I have a spreadsheet with over 1,000 addresses that need to be managed in DecapCMS. To achieve this, I uploaded the spreadsheet as a CSV file using the file upload widget and triggered the postSave event via Address Updates collection. While I was able to read the file content and parse it to extract the data, I couldn't find a way to create entries in the "Address" collection programmatically within DecapCMS.

**Describe the solution you'd like**

I initially thought the CMS API would provide a method to create collection entries, but I couldn't find such functionality. A wrapper CMS API would be an ideal solution, as it could handle the complexities of different Git gateways or backends seamlessly under the hood.